<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>key的原理</title>
    <script type="text/javascript" src="../js/vue.js"></script>
</head>
<body>
    <div id="root">
        <!--遍历数组-->
        <h2>人员列表</h2>
        <button @click.once="add">添加一个老刘</button>
        <ul>
            <li v-for="p in persons" :key="p.id">
                {{p.name}}-{{p.age}}
                <input type="text">
            </li>
        </ul>
    </div>
</body>
<script type="text/javascript">
    Vue.config.productionTip=false;
    new Vue({
        el:'#root',
        data:{
            persons:[
                {id:'001',name:'张三',age:18},
                {id:'002',name:'李四',age:19},
                {id:'003',name:'王五',age:20}
            ]
        },
        methods: {
            add(){
                const p={id:'004',name:'老刘',age:'40'}
                this.persons.push(p)
            }
        }
    })
</script>
</html>